Method for loading custom control to Qt designer through script description

Abstract

The invention relates to the technical field of computer programming, in particular to a method for loading a user-defined control to a Qt designer through script description, which comprises the following steps of: dynamically creating a user-defined control instance through a reflection mechanism, compiling the user-defined control into a dynamic link library, and describing the class name, attribute, personalization and dynamic library path of the control by using an XML (Extensible Markup Language) script. Finally, the XML script is analyzed through the plug-in module, a dynamic library is loaded, and a control is registered to a Qt designer; according to the method, the control is dynamically created through the reflection mechanism, the meta-information of the control is described in combination with the XML script, and the self-defined control is dynamically loaded to the Qt designer by utilizing the Qt plug-in technology, so that the problems of static coupling, poor expansibility and low development efficiency of a traditional scheme are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of computer programming, and in particular to a method for loading a custom control into a Qt designer through script description. Background Art

[0002] The present invention belongs to the field of software development technology, and specifically relates to a method for loading custom controls into a Qt designer through script description based on a reflection mechanism and a Qt plug-in mechanism. The method is particularly suitable for scenarios in which controls are dynamically created, metadata parsed, and seamlessly integrated into a Qt designer through script description.

[0003] Currently, there are usually several problems with the development and integration of custom controls in the Qt framework. First, there is strong static dependency. The traditional method requires hard-coding the control code into the main program or static library. Modifying the control requires recompiling the entire application, which reduces development efficiency. Second, there is insufficient scalability. Adding or modifying controls requires directly modifying the code framework, which cannot achieve dynamic expansion and is difficult to adapt to the needs of rapid iteration. Third, there is a lack of a unified description mechanism. Existing technologies, such as the Qt plug-in mechanism, require manual writing of plug-in interface code, and lack a standardized description method for meta-information such as control properties and signals / slots.

[0004] In the prior art, although reflection technology, such as Qt's meta-object system, supports dynamic creation of objects, it is not deeply integrated with the Qt designer; and although the Qt plug-in mechanism (such as QPluginLoader) can dynamically load controls, it lacks scripted configuration support for control meta-information. The present invention solves the above problems by combining the reflection mechanism, dynamic library encapsulation and XML scripted description.

[0005] The present invention provides a method for dynamically creating controls through a reflection mechanism, describing control meta-information in combination with XML scripts, and dynamically loading custom controls into a Qt designer using Qt plug-in technology, thereby solving the problems of static coupling, poor scalability, and low development efficiency of traditional solutions. Summary of the Invention

[0006] In order to overcome the problems of static coupling, poor scalability and low development efficiency of traditional solutions, the present invention proposes a method for loading a custom control into the Qt designer through script description.

[0007] The technical solution of the present invention is: a method for loading a custom control into a Qt designer through a script description, comprising the following steps:

[0008] S1, dynamically create custom control instances through reflection mechanism;

[0009] S2, compile the custom control into a dynamic link library;

[0010] S3, uses XML script to describe the control's class name, attributes, personalization, and dynamic library path;

[0011] S4, parses the XML script and loads the dynamic library through the plug-in module, and registers the control to the Qt designer.

[0012] Preferably, the reflection mechanism is implemented through meta-information description, including dynamic instantiation and attribute operation.

[0013] Preferably, the XML script contains the following meta information:

[0014] Control class name;

[0015] Dynamic library path;

[0016] Editable properties and default values.

[0017] Preferably, the plug-in module is integrated with the designer through Qt's QDesignerCustomWidgetInterface interface, and supports control dragging and property editing.

[0018] Preferably, the method further includes monitoring script and dynamic library file changes, triggering the function of reloading and updating the designer control list.

[0019] Preferably, the dynamic link library supports cross-platform deployment, including Windows, Linux and macOS.

[0020] Preferably, the XML script describes the control meta-information in a standardized manner to reduce repeated coding.

[0021] Preferably, a reflection driver module is used to dynamically create a control instance;

[0022] Dynamic library encapsulation module, by compiling custom controls into dynamic link libraries, supports runtime loading;

[0023] XML script parsing module, which describes the dependency library path, control name, attributes, and personalization information through XML script;

[0024] Plugin loading and designer integration module, used to register controls to Qt Designer.

[0025] Preferably, the reflection driving module realizes registration and dynamic instantiation of the control class through macro definition.

[0026] Preferably, the plug-in loading and designer integration module injects controls into the Qt designer control panel via QDesignerFormWindowInterface, and supports dragging and dropping.

[0027] Beneficial effects of the present invention:

[0028] 1. To add a new control, you only need to write a dynamic library and XML script, without modifying the main program or restarting the designer.

[0029] 2. Standardize control descriptions through XML scripts to reduce duplicate coding and improve development efficiency.

[0030] 3. The present invention is natively compatible with Qt Designer and supports native functions such as property editing and signal / slot connection.

[0031] 4. This invention is based on the Qt framework and supports deployment on multiple platforms such as Windows, Linux, and macOS. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 What is shown is a schematic diagram of the solution flow of the present invention;

[0033] Figure 2 Shown is a schematic diagram of the developer side process of the present invention;

[0034] Figure 3 What is shown is a schematic diagram of the system side flow chart of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 A method for loading a custom control into Qt Designer through a script description includes the following steps:

[0037] S1, dynamically create custom control instances through reflection mechanism;

[0038] S2, compile the custom control into a dynamic link library;

[0039] S3, uses XML script to describe the control's class name, attributes, personalization, and dynamic library path;

[0040] S4, parses the XML script and loads the dynamic library through the plug-in module, and registers the control to the Qt designer.

[0041] The reflection mechanism is implemented through meta-information description, including dynamic instantiation and attribute operation.

[0042] The XML script contains the following meta information:

[0043] Control class name;

[0044] Dynamic library path;

[0045] Editable properties and default values.

[0046] The plug-in module is integrated with the designer through Qt's QDesignerCustomWidgetInterface interface, supporting control dragging and property editing.

[0047] This method also includes monitoring script and dynamic library file changes, triggering the reloading and updating of the designer control list.

[0048] The dynamic link library supports cross-platform deployment, including Windows, Linux, and macOS.

[0049] The XML script describes the control meta information in a standardized manner, reduces repeated coding, and improves development efficiency.

[0050] Reflection driver module, used to dynamically create control instances;

[0051] Dynamic library encapsulation module, by compiling custom controls into dynamic link libraries, supports runtime loading;

[0052] XML script parsing module, which describes the dependency library path, control name, attributes, and personalization information through XML script;

[0053] Plugin loading and designer integration module, used to register controls to Qt Designer.

[0054] The reflection driving module realizes the registration and dynamic instantiation of the control class through macro definition.

[0055] The plug-in loading and designer integration module injects controls into the Qt designer control panel through QDesignerFormWindowInterface and supports dragging and dropping.

[0056] Example 1: Dynamic creation of controls using reflection mechanism. Control class definition:

[0057]

[0058] Control class implementation:

[0059]

[0060] Reflection technology to implement and dynamically instantiate controls:

[0061]

[0062]

[0063]

[0064] Example 2: XML script description.

[0065]

[0066]

[0067]

[0068] Implementation 3: XML parsing and plug-in loading, the steps are as follows: S1, XML parser implementation:

[0069]

[0070] S2, register the plug-in to the designer:

[0071]

[0072]

[0073]

[0074] See also Figure 2 and Figure 3 , the core steps of the present invention are:

[0075] The reflection mechanism enables dynamic creation of controls --> custom controls are encapsulated and compiled into a library --> XML scripts describe the control library installation path and custom control information --> plug-in loading and designer integration.

[0076] S1. The plug-in scans the XML script and parses it to generate a list of control metadata.

[0077] S2. Use a custom class derived from QDesignerCustomWidgetInterface to process the parsed widget metadata and complete the dynamic creation of the custom widget.

[0078] S3. Inject the control into the Qt Designer control panel through QDesignerFormWindowInterface, supporting drag and drop.

[0079] S4. Trigger reloading and updating of the designer control list by monitoring changes in scripts and dynamic library files.

[0080] Furthermore, a detailed description is given of how the reflection mechanism is used to dynamically create controls:

[0081] Its purpose is to dynamically instantiate control objects through class name strings, thus avoiding hard-coded dependencies.

[0082] The steps are:

[0083] The first step is to register the control class. Use macro declarations in the control class header file, such as DECLARE_WIDGET_REFLECT, to mark the class as supporting reflection, and use macro implementations in the source file, such as IMPL_WIDGET_REFLECT, to register the class name and its constructor in the mapping table of the global reflection factory.

[0084] In the second step, the reflection driver module maintains a global mapping table. The key is the class name string, such as "Form", and its value is the corresponding constructor. When a control needs to be created, the createWidget method is called and the class name is passed in. The reflection driver module searches the mapping table according to the class name and calls the constructor to return the instantiated object.

[0085] Furthermore, a detailed description is given on how to encapsulate custom controls and compile them into libraries:

[0086] Its purpose is to compile the control code into a dynamic link library to support runtime loading.

[0087] The steps are:

[0088] The first step is to compile the custom control code, such as the Form class, into a platform dynamic library. For Windows: generate a .dll file, such as BaseControls.dll; for Linux / macOS: generate a .so file, such as libBaseControls.so;

[0089] The second step is to export the reflection interface. The dynamic library needs to expose a unified entry function, such as reflect, which receives the class name string and calls the reflection factory to create an instance.

[0090] Furthermore, a detailed description is given of the XML script describing the control library installation path and custom control information:

[0091] Its purpose is to define the control's library path, properties, icons and other metadata through standardized XML files.

[0092] The steps are:

[0093] To design the script content, first specify the installation location of the dynamic library, for example, / designer / custom / lib / BaseControls.dll, and then define the control information:

[0094] Class name, such as "Form";

[0095] Default properties, such as the initial size of the geometry;

[0096] Icon path, used for display in Qt Designer.

[0097] Finally, the XML template of the control in Qt Designer is described for serialization / deserialization.

[0098] Furthermore, a detailed description of plugin loading and designer integration is given:

[0099] Its purpose is to parse XML scripts, load dynamic libraries, and register controls with Qt Designer.

[0100] The steps are:

[0101] The first step is to use Qt's QDomDocument to parse the XML file, extract the control library path, class name, icon and other information, and generate a list of control metadata in memory, such as DomControl objects;

[0102] The second step is to load the dynamic library through QPluginLoader according to the path in XML, and call the reflect function in the library to verify whether the control is available;

[0103] The third step is to implement the QDesignerCustomWidgetInterface interface, provide the control creation method, name, icon and other information, and add the control to the designer's control panel through the QDesignerFormEditorInterface;

[0104] The fourth step is to monitor changes in XML files or dynamic libraries, such as file modification timestamps, and trigger re-parsing and reloading to update the control list in the designer in real time.

[0105] Through the above steps, controls are dynamically created through the reflection mechanism, XML scripts are combined to describe control metadata, and Qt plug-in technology is used to dynamically load custom controls into the Qt designer, solving the problems of static coupling, poor scalability, and low development efficiency of traditional solutions.

Claims

1. A method for loading a custom control into a Qt designer through a script description, characterized in that: The following steps are included: S1, dynamically create custom control instances through reflection mechanism; S2, compile the custom control into a dynamic link library; S3, uses XML script to describe the control's class name, attributes, personalization, and dynamic library path; S4, parses the XML script and loads the dynamic library through the plug-in module, and registers the control to the Qt designer.

2. The method of loading a custom control into Qt Designer through a script description according to claim 1, characterized in that: The reflection mechanism is implemented through meta-information description, including dynamic instantiation and attribute operation.

3. The method of loading a custom control into Qt Designer through a script description according to claim 1, characterized in that: The XML script contains the following meta information: Control class name; Dynamic library path; Editable properties and default values.

4. The method of loading a custom control into Qt Designer through a script description according to claim 1, characterized in that: The plug-in module is integrated with the designer through Qt's QDesignerCustomWidgetInterface interface, supporting control dragging and property editing.

5. The method of loading a custom control into Qt Designer through script description according to claim 1, characterized in that: It also includes the ability to monitor script and dynamic library file changes, trigger reloading, and update the designer control list.

6. The method of loading a custom control into Qt Designer through a script description according to claim 1, characterized in that: The dynamic link library supports cross-platform deployment, including Windows, Linux and macOS.

7. The method of loading a custom control into Qt Designer through a script description according to claim 1, characterized in that: The XML script describes the control meta information in a standardized manner, thereby reducing repeated coding.

8. A method for loading a custom control into Qt Designer via a script description, characterized by: Reflection driver module, used to dynamically create control instances; Dynamic library encapsulation module, by compiling custom controls into dynamic link libraries, supports runtime loading; XML script parsing module, which describes the dependency library path, control name, attributes, and personalization information through XML script; Plugin loading and designer integration module, used to register controls to Qt Designer.

9. The method of loading a custom control into Qt Designer through a script description according to claim 8, characterized in that: The reflection driving module realizes the registration and dynamic instantiation of the control class through macro definition.

10. The method of loading a custom control into Qt Designer through script description according to claim 8, characterized in that: The plug-in loading and designer integration module injects controls into the Qt designer control panel through QDesignerFormWindowInterface and supports dragging and dropping.

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